Hybrid Landy NOx Sensor Issues Cause Exhaust Leaks

As someone with moderate experience working on hybrids, I dealt with a similar issue on my 2018 Suzuki Swace hybrid. The symptoms you describe match what I encountered, check engine light, multiple codes, and emission system warnings. The NOx sensor failure caused irregular air-fuel ratio readings in my case. After initial diagnostic tests, it turned out the main issue was actually just a damaged cable connection to the sensor, not the sensor itself. The fix was relatively straightforward, 95€ for cleaning the connection points and replacing the damaged wiring harness section. The repair took about 2 hours at my regular workshop. They performed a complete diagnostic scan before and after to ensure no other components were affected. The catalytic converter and other emission control systems were checked and found to be working properly once the connection was fixed. Before suggesting more specific solutions, could you share: Current mileage on your Landy, Exact error codes from the diagnostic scan, Whether you notice any performance issues, When the check engine light first appeared, Any recent maintenance work done This information would help determine if your issue matches my experience or might need different attention.

Thanks for sharing your experience. With 153771 KM on my Landy, emission problems are not totally unexpected, though still frustrating for a 2020 model. After reading about your case, I checked the wiring connections around the nitrogen oxide sensor but they appear intact. The check engine light persists and exhaust leak continues despite verifying all visible connections. The pollution control system warning keeps triggering even after clearing the codes. The main difference seems to be that my diagnostic scan shows sensor failure codes consistently returning after resets, suggesting the emission sensor itself might be the culprit rather than just wiring. Based on this, I will proceed with having the workshop check the actual sensor components. I appreciate the detailed cost breakdown from your repair. Will update once I get a proper diagnosis from the shop.

Thanks for the follow-up details about your Landy. After hearing about the recurring codes and higher mileage, I think youre right that your case differs from my initial wiring issue. The consistent sensor failure codes definitely point toward the emission sensor itself being faulty, especially with that persistent exhaust leak. On my Swace, when the nitrogen oxide sensor actually failed a year after the wiring fix, the symptoms were nearly identical to what youre describing. The catalytic converter efficiency also dropped noticeably. The full sensor replacement ended up costing 450€, quite a bit more than just fixing connections. Your diesel engine likely uses a more complex pollution control system than my hybrid setup, but the diagnostic approach should be similar. The workshop will need to verify if the sensor degradation is affecting the catalytic converter performance too, as they often impact each other. One tip from my experience: request they check the exhaust manifold gaskets while investigating the leak. When my emission sensor failed, it turned out a deteriorating gasket was contributing to the problem. Getting both fixed at once saved another workshop visit. Looking forward to hearing what the workshop finds. The consistent error codes returning after resets definitely suggest component replacement rather than just a connection issue this time.

Thanks to everyone who shared their experiences. After considering the feedback and comparing symptoms, I decided to take my Landy to the workshop today. The diagnostic results confirmed what many suggested, my NOx sensor needs complete replacement. The technician found the emission sensor had indeed failed, causing the persistent error codes and exhaust issues. The cost estimate is around 500€ for parts and labor, slightly higher than mentioned earlier due to additional gasket replacements needed in the pollution control system. Thankfully no catalytic converter damage was found, which would have made repairs much more expensive. The nitrogen oxide readings were way off normal parameters, explaining the air-fuel mixture problems I noticed. The workshop can fit me in next week for the repair. They estimate about 3-4 hours of work to replace the faulty sensor and associated components. Will get the exhaust manifold gaskets done at the same time as suggested. Appreciate all the guidance that helped me understand the issue before visiting the shop. It definitely made the diagnostic discussion more productive.